What happened in Dark Knight?

Can you elaborate on the key events that unfolded in The Dark Knight? I'm particularly interested in understanding the challenges faced by Batman, the rise of the Joker as a formidable villain, and the impact their confrontation had on Gotham City. How did the film explore themes of morality, chaos, and the blurred line between good and evil? Additionally, what role did the supporting characters play in shaping the narrative and advancing the plot?